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Absolute Proper Motion of the Fornax Dwarf Spheroidal Galaxy from Photographic and<i>Hubble Space Telescope</i>WFPC2 Data
We have measured the absolute proper motion of the Fornax dwarf spheroidal galaxy from a combination of photographic plate material and Hubble Space Telescope Wide Field Planetary Camera 2 data that provide a time baseline of up to 50 yr. The extragalactic reference frame consists of eight QSO images and …